The Bureau of Meteorology has issued a with heavy rain and thunderstorms forecast to move across the state from the west from Thursday night.
Senior forecaster Scott Williams said the heaviest storms were set to hit Melbourne and the state's north and north-east late on Friday night and into the early hours of Saturday.
"I don't think I've ever seen such a deep low form over Victoria whilst we've got this moisture around," he said.
"So to that extent we are a little bit in unchartered territory in terms of the weather.
"This is a very big event, a very widescale event and it’s right at the top end of rainfalls we’ve seen in the last 30 years.”
If current predictions transpire most of the severe action will take place overnight but Traders may need to prepare for extreme rain conditions. For instance, traders in J,K Sheds may experience flooding and stock damage at the back of their stalls as the drains in the dip between the two sheds overflow. This has become an irregular but potentially damaging event over the years and the conditions in the photo above occurred earlier this month. Other areas of the market will have known issues.